C-Johnston

//Flatten a nested array.
//You must account for varying levels of nesting.

function steamroller(arr) {
  var flatenArr=[], i;
  
  function checkNested(arr2) {
    for (var x=0;x<arr2.length;x++) {
    if (!Array.isArray(arr2[x]))
      flatenArr.push(arr2[x]);